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Carcinogenicity test in B6C3F1 mice after parental and prenatal exposure to 50 Hz magnetic fields

✍ Scribed by Yoshihisa Otaka; Tetsuo Chida; Yasuhiko Yamagishi; Satoshi Kitamura

Publisher: John Wiley and Sons
Year: 2002
Tongue: English
Weight: 109 KB
Volume: 23
Category: Article
ISSN: 0197-8462
DOI: 10.1002/bem.10012

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Some epidemiological studies suggest association of childhood cancer with occupational exposure of the parents to magnetic fields. To test this relationship, 50 each of C57BL/6J female and C3H/HeJ male mice were exposed for 2 and 9 weeks, respectively, to 50 Hz sham (group A), 0.5 (group B), and 5 mT (group C) sinusoidal alternating magnetic fields. They were mated under the exposure for up to 2 weeks, and the exposure was continued until parturition. All the B6C3F1 offspring, without adjusting numbers of animals, were clinically observed without exposure to magnetic field for a nominal 78 weeks from 6–8 weeks of age after weaning and then euthanized for pathological examination according to a routine carcinogenicity test. 540 pups entered the test, and the survival rate was 96.7%. No F1 mouse died of tumoral diseases before a male in A group died of stomach cancer at 43 weeks of age. The first animal death in the exposed groups due to tumor occurred at 71 weeks of age. Eighteen animals died before necropsy at 84–86 weeks of age. No significant difference was detected in the final number of survivors and incidence of tumors between groups A and B, or A and C. Concerning reproduction total implants in group B were less than in group A and the difference was on the borderline of significance (P = .05). This difference was not reproduced in a later duplicate experiment. Bioelectromagnetics 23:206–213, 2002. © 2002 Wiley‐Liss, Inc.

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